F-4436-24A1 bell assembly provides an easy low cost solution for adding bells to the AP21-BP1 or MC41-BP1 bell programmer. One F-4436-24A1 can be added to any AP21-BP1 or MC41-BP1 bell programmer up to 100ft away. For bell systems with more than two bells, larger power modules are available. However, a heavy duty cable may be required for wiring the bells.